Power line chokes
Current-compensated ring core double choke
300 V AC, 25 A, 1.7 mH, +70 °C
May 2015
 EPCOS AG 2015. Reproduction, publication and dissemination of this publication, enclosures hereto and the information
contained therein without EPCOS' prior express consent is prohibited.
EPCOS AG is a TDK Group Company.
Power line chokes
Current-compensated ring core double choke
Rated voltage 300 V AC
Rated inductance 1.7 mH
Rated current 25 A / +70 °C
Current-compensated frame core double choke
Ferrite core with epoxy coating (UL 94-V0)
Additional PET core insulation
Sector winding
High resonance frequency
Approx. 0.6% stray inductance for symmetrical interference suppression
High rated current and rated temperature
Suitable for wave soldering
Design complies with EN 60938-2 (VDE 0565-2)
UL 1446 class 155(F) electrical insulation system
No adhesives used
Suppression of common-mode and differential-mode interferences
Switch-mode power applications
Power inverters
Frequency converters
■ Ends of winding wires
■ Hot-dip tinned
Product brand, electrical insulation system designation, ordering code,
rated voltage, rated inductance, rated current,
date of manufacture (YYWWD.internal ID code), production place identification code
Delivery mode
■ Blister tray in a cardboard box
Please read Cautions and warnings and
Important notes at the end of this document.
Power line chokes
Current-compensated ring core double choke
Dimensional drawing and layout recommendation
Please read Cautions and warnings and
Important notes at the end of this document.
Power line chokes
Current-compensated ring core double choke
Technical data and measuring conditions
Rated voltage VR
300 V AC (50/60 Hz)
Test voltage Vtest
2000 V AC, 2 s (line/line)
Rated temperature TR
+70 qC
Rated current IR
Referred to 50 Hz and rated temperature
Rated inductance LR
Measured with Agilent 4284A at 10 kHz, 0.1 mA, +20 °C.
Inductance is specified per winding.
Inductance tolerance
–30/+50% at +20 °C
Inductance decrease'L/L0
< 10% at DC magnetic bias with IR, +20 °C
Stray inductance Lstray,typ
Measured with Agilent 4284A at 10 kHz, 5 mA, +20 °C,
typical values
DC resistance Rtyp
Measured at +20 °C, typical values, specified per winding
Solderability (lead-free)
Sn96.5Ag3.0Cu0.5: +(245 r5) °C, (3 r0.3) s
Wetting of soldering area t95%
(to IEC 60068-2-20, test Ta)
Resistance to soldering heat
(wave soldering)
+(260 r5) °C, (10 r1) s
(to IEC 60068-2-20, test Tb)
Climatic category
40/125/56 (to IEC 60068-1)
Storage conditions (packaged)
–25 °C … +40 °C, d75% RH
Approx. 150 g
UL1446 Class 155 (F) (E320370)
Characteristics and ordering codes
Ordering code
1) Alternative ratings: 22.5 A at +80 °C, 21 A at +85 °C
Please read Cautions and warnings and
Important notes at the end of this document.
Power line chokes
Current-compensated ring core double choke
Current derating Iop/IR
versus ambient temperature TA
Impedance |Z| versus frequency f
measured with windings in parallel at +20 °C
typical values
Please read Cautions and warnings and
Important notes at the end of this document.
Cautions and warnings
■ Please note the recommendations in our Inductors data book (latest edition) and in the data
– Particular attention should be paid to the derating curves given there.
– The soldering conditions should also be observed. Temperatures quoted in relation to wave
soldering refer to the pin, not the housing.
■ If the components are to be washed varnished it is necessary to check whether the washing
varnish agent that is used has a negative effect on the wire insulation, any plastics that are used,
or on glued joints. In particular, it is possible for washing varnish agent residues to have a
negative effect in the long-term on wire insulation.
Washing processes may damage the product due to the possible static or cyclic mechanical
loads (e.g. ultrasonic cleaning). They may cause cracks to develop on the product and its parts,
which might lead to reduced reliability or lifetime.
■ The following points must be observed if the components are potted in customer applications:
– Many potting materials shrink as they harden. They therefore exert a pressure on the plastic
housing or core. This pressure can have a deleterious effect on electrical properties, and in
extreme cases can damage the core or plastic housing mechanically.
– It is necessary to check whether the potting material used attacks or destroys the wire
insulation, plastics or glue.
– The effect of the potting material can change the high-frequency behaviour of the components.
■ Ferrites are sensitive to direct impact. This can cause the core material to flake, or lead to
breakage of the core.
■ Even for customer-specific products, conclusive validation of the component in the circuit can
only be carried out by the customer.
Display of ordering codes for EPCOS products
The ordering code for one and the same product can be represented differently in data sheets,
data books, other publications and the website of EPCOS, or in order-related documents such as
shipping notes, order confirmations and product labels. The varying representations of the
ordering codes are due to different processes employed and do not affect the
specifications of the respective products. Detailed information can be found on the Internet
under www.epcos.com/orderingcodes.
Please read Cautions and warnings and
Important notes at the end of this document.
Important notes
The following applies to all products named in this publication:
1. Some parts of this publication contain statements about the suitability of our products for
certain areas of application. These statements are based on our knowledge of typical
requirements that are often placed on our products in the areas of application concerned. We
nevertheless expressly point out that such statements cannot be regarded as binding
statements about the suitability of our products for a particular customer application. As
a rule, EPCOS is either unfamiliar with individual customer applications or less familiar with them
than the customers themselves. For these reasons, it is always ultimately incumbent on the
customer to check and decide whether an EPCOS product with the properties described in the
product specification is suitable for use in a particular customer application.
2. We also point out that in individual cases, a malfunction of electronic components or
failure before the end of their usual service life cannot be completely ruled out in the
current state of the art, even if they are operated as specified. In customer applications
requiring a very high level of operational safety and especially in customer applications in which
the malfunction or failure of an electronic component could endanger human life or health (e.g.
in accident prevention or life-saving systems), it must therefore be ensured by means of suitable
design of the customer application or other action taken by the customer (e.g. installation of
protective circuitry or redundancy) that no injury or damage is sustained by third parties in the
event of malfunction or failure of an electronic component.
3. The warnings, cautions and product-specific notes must be observed.
4. In order to satisfy certain technical requirements, some of the products described in this
publication may contain substances subject to restrictions in certain jurisdictions (e.g.
because they are classed as hazardous). Useful information on this will be found in our
Material Data Sheets on the Internet (www.epcos.com/material). Should you have any more
detailed questions, please contact our sales offices.
5. We constantly strive to improve our products. Consequently, the products described in this
publication may change from time to time. The same is true of the corresponding product
specifications. Please check therefore to what extent product descriptions and specifications
contained in this publication are still applicable before or when you place an order.
We also reserve the right to discontinue production and delivery of products.
Consequently, we cannot guarantee that all products named in this publication will always be
available. The aforementioned does not apply in the case of individual agreements deviating
from the foregoing for customer-specific products.
6. Unless otherwise agreed in individual contracts, all orders are subject to the current version
of the “General Terms of Delivery for Products and Services in the Electrical Industry”
published by the German Electrical and Electronics Industry Association (ZVEI).
7. The trade names EPCOS, Alu-X, CeraDiode, CeraLink, CeraPad, CeraPlas, CSMP, CSSP,
CTVS, DeltaCap, DigiSiMic, DSSP, ExoCore, FilterCap, FormFit, LeaXield, MiniBlue, MiniCell,
MKD, MKK, MotorCap, PCC, PhaseCap, PhaseCube, PhaseMod, PhiCap, PQSine, SIFERRIT,
ThermoFuse, WindCap are trademarks registered or pending in Europe and in other
countries. Further information will be found on the Internet at www.epcos.com/trademarks.